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The following essay will be looking at the factors that cause pollution and the effect that pollution has on our world today It will also investigate what it has in store for the future if things do not improve It will also explore some of the methods used to treat and clean-up wastewater and oil spills Today the industrialization of Canada is severely affecting this nations lakes streams and rivers If something is not done to improve the situation it is going to have some severe environmental problems in its future Today pollution is very high in both inland and marine waters All different types of water pollution are contributing factors in this problem Here are some things that are associated with pollution Pathogens Pathogens are disease causing bacteria viruses and protozoa They usually come from human sewage As pathogen numbers increase so does the risk of human health Biochemical Oxygen Demand Organic wastes that decay in a body of water decrease the amount of oxygen found in it The living things in the lake need oxygen to survive If the oxygen level is depressed to zero all fish in the lake die Any decomposition that does not contain oxygen starts to generate noxious gases such as Hydrogen Sulfide Pulp and paper mills and municipal sewage causes BOD Nutrients Nutrients particularly nitrogen and phosphorus enrich waters and accelerate the aging of lakes and streams Also the result of this is rich plant life which prohibits recreational activities Plankton blooms depress oxygen levels as mentioned before and therefore endanger living organisms Major sources of nutrients are municipal sewage and agricultural runoff Toxic Materials Can affect the health of aquatic organisms and their consumers and the people who drink the contaminated water The toxicants include lead mercury DDT PCB benzopyrene oil and dibutyl phthalate These chemicals enter the lake through dumping by the factories Temperature Changes Temperature changes from waste heat discharges like from a
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